Wiring Fault
A wiring fault can cause one or more zones to fail, cross-activate, or blow controller fuses. Finding and fixing underground wire breaks requires systematic testing.
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Symptoms
- Multiple zones don't work or behave erratically
- Two zones run at the same time when only one is programmed
- Controller fuse blows when a specific zone is activated
Diagnosis
One or more underground wires are cut, shorted together, or shorted to ground. Common causes: shovel damage, rodent chewing, deteriorated insulation.
Step-by-Step Repair
- 1
At the controller, disconnect all zone wires. Measure the resistance from each zone wire to the common wire. Normal: 20-60 ohms (the solenoid). Very high or open = broken wire. Very low or 0 = short circuit.
- 2
For a broken wire: if you have spare conductors in your wire bundle, re-land the zone on a spare wire at both the controller and valve ends.
- 3
For a short circuit: look for areas where wires may have been exposed (recent digging, edging, pest damage). Inspect and repair the insulation.
- 4
If you can't locate the fault, a professional can use a wire tracker/locator to trace the exact break point underground.
- 5
Always use waterproof wire connectors for any splice repairs.
Parts Needed
- •Sprinkler Wire × 100
- •Waterproof Wire Connectors × 1
Pro Tips
- Always install 2-3 extra wire conductors in your bundle as spares. It's much easier to re-land on a spare than to run new wire.
Prevention Tips
- Bury wire at least 12 inches deep and never staple it to pipe — a shovel can cut both at once.
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